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Author Topic: 1968 CL175 repair and build  (Read 8798 times)

Offline advCo

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Re: 1968 CL175 repair and build
« Reply #40 on: Sep 29, 2016, 14:56:36 »
Sounds like your pilot circuit is clogged still. Find a parts fiche for the carbs from any Honda dealers website it will tell you exactly what every part is.


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Offline medicalmechanica

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Re: 1968 CL175 repair and build
« Reply #41 on: Oct 01, 2016, 22:40:38 »
Alright, so I've disassembled and cleaned the carbs for the second time now, put everything back together, installed it on the bike, balanced the throttle slides, and I can sometimes get the bike to start. It bogs under heavy throttle input, and will not start without the choke at about 90% and a goose from the throttle, and even then not every time. Both cylinders are getting warm at the exhaust, but the right side is a bit cooler so I'm guessing it's running leaner than the left cylinder. I don't really know how to adjust carbs so I'm going to have to read up on it, but at least it's something.

Offline teazer

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Re: 1968 CL175 repair and build
« Reply #42 on: Oct 02, 2016, 13:43:01 »
Did you spray through the tiny holes into the bore that the pilot jet discharges from.  They are tiny and they block easily

Offline medicalmechanica

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Re: 1968 CL175 repair and build
« Reply #43 on: Oct 05, 2016, 23:17:32 »
Did you spray through the tiny holes into the bore that the pilot jet discharges from.  They are tiny and they block easily
I can see daylight through all of the jets, and the carb housing and everything is super clean. There are tiny little holes inside the opening of the carb in front of the slide, do they go straight through or are they just cast in? I honestly can't find anything else to clean because I've done both a number of times now. I'm thinking I should try swapping the carbs and starting to see if that works at all.

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Edit: When I get it started if I cover the right side carb the bike revs way up. I don't know if that's helpful, or if because the right side isn't running in basically just plugging a vacuum leak.
« Last Edit: Oct 05, 2016, 23:21:55 by medicalmechanica »

Offline medicalmechanica

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Re: 1968 CL175 repair and build
« Reply #44 on: Oct 18, 2016, 18:49:28 »
Well I was able to ride this little thing today for about ten minutes. It starts alright with no choke, but I'm still getting a much cooler exhaust pipe on the right side. The bike also bogs pretty heavily under throttle and then will catch up, which I'm thinking means it's running rich. If I tip the bike to the left it'll idle up a bit which is weird, and it really doesn't like moving forward haha. I'm getting some white smoke from the exhaust now, so I don't really know where to go from here.

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Offline teazer

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Re: 1968 CL175 repair and build
« Reply #45 on: Oct 19, 2016, 15:09:48 »
I can see daylight through all of the jets, and the carb housing and everything is super clean. There are tiny little holes inside the opening of the carb in front of the slide, do they go straight through or are they just cast in? I honestly can't find anything else to clean because I've done both a number of times now. I'm thinking I should try swapping the carbs and starting to see if that works at all.


Those super tiny holes are above the pilot jets and it's hard/impossible to see through them.  The trick is to fire carb cleaner up through the pilot jet and look to see that it sprays out of the holes - wear goggles and do that outside or with lots of ventilation.

Much cooler exhaust suggests that the pilot jet is still blocked on that side.  And yes, they are a PIA design that clogs so easily and is so hard to get clean.

Offline medicalmechanica

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Re: 1968 CL175 repair and build
« Reply #46 on: Oct 19, 2016, 16:00:26 »
That's super good info, thanks! I'll take the carbs apart again today and run through everything with some safety wire or something and see where that gets me.

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Offline medicalmechanica

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Re: 1968 CL175 repair and build
« Reply #47 on: Oct 20, 2016, 03:25:18 »
Well I swapped the carbs for kicks and my cold cylinder is now my hot cylinder. This tells me that there's for sure something up with the right side carb, but I took it apart and I can't find a single spot that's clogged. Per Teazer's suggestion I blew through the tiny hole in the top of the intake side of the carb and air moves freely through that jet. The needle jet and jet needle are functioning correctly, and I know that fuel is moving through the fuel lines. I'm thinking about trying to track down another stock carb and see where that takes me.

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Offline medicalmechanica

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Re: 1968 CL175 repair and build
« Reply #48 on: Oct 21, 2016, 16:40:30 »
Learned two things today!

Thing one, I'm retarded.
Thing two, I have a 180 main jet and a 98 main jet. My suspicion that the right side carb was too rich is true, the carb on that side had like twice as much fuel going to it. Ordered a rebuild kit and I'm confident that two 98s will do it haha. Now all I need is to find a good cam and I'll have a perfect little bike, fingers crossed.

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Offline teazer

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Re: 1968 CL175 repair and build
« Reply #49 on: Oct 21, 2016, 17:26:21 »
FYI, 180 main jet in a keihin carb 1.8mm diameter and that will flow 4 x as much fuel as a #90.  Or did it have a minkuni jet in that carb?

Go on line or contact your dealer and see if you can get two good new Keihin main jets for that carb.  Early and late Honda's use different threads - same diameter but different pitch. I can't remember which pitch the 175 used and what that is compatible with but can check it over the weekend if you need.